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首页> 外文期刊>Case Studies in Construction Materials >Applications of smart piezoelectric materials in a wireless admittance monitoring system (WiAMS) to Structures—Tests in RC elements
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Applications of smart piezoelectric materials in a wireless admittance monitoring system (WiAMS) to Structures—Tests in RC elements

机译：智能压电材料在结构的无线导纳监测系统（WiAMS）中的应用-RC元件中的测试

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The application of an innovative real-time structural health monitoring system is studied through tests performed on flexural and shear-critical reinforced concrete elements subjected to monotonic and cyclic loading. The test set-up involves a Wireless impedance/Admittance Monitoring System (WiAMS) that comprises specially manufactured small-sized portable devices to collect the voltage frequency responses of an array of smart piezoelectric transducers mounted on structural members of reinforced concrete constructions. Damage detection and evaluation is achieved using the in-situ measurements of the integrated piezoelectric sensors/actuators signals at the healthy state of the member and at various levels of damage during testing. Three different installations of Piezoelectric lead Zirconate Titanate (PZT) transducers are examined: (a) epoxy bonded PZTs on the surface of the steel reinforcing bars of the flexural elements, (b) PZTs embedded inside the concrete mass of the shear-critical beams and (c) externally epoxy bonded PZTs attached to the concrete surface of the tested elements. The smart piezoelectric materials have been pre-installed before testing based on the potential flexural and shear cracking of the elements. Quantitative assessment of the examined damage levels using values for the statistical damage index is also presented and discussed. Voltage signals and index values acquired from the PZTs’ measurements using the proposed wireless monitoring technique demonstrated obvious discrepancies between the frequency response of the healthy and the examined damage levels for every tested element. These differences clearly indicate the presence of damage, whereas their gradation reveals the magnitude of the occurred damage. Promising results concerning the prediction of the forthcoming fatal failures at early damage stages have also been derived.
机译：通过对承受单调和循环荷载的抗弯和抗剪钢筋混凝土构件进行测试，研究了创新的实时结构健康监测系统的应用。测试设置涉及无线阻抗/导纳监测系统（WiAMS），该系统包括专门制造的小型便携式设备，以收集安装在钢筋混凝土结构构件上的智能压电传感器阵列的电压频率响应。通过在构件的健康状态下以及在测试过程中的各种损坏水平下使用集成压电传感器/执行器信号的原位测量，可以实现损坏的检测和评估。检查了压电锆钛酸铅（PZT）传感器的三种不同安装方式：（a）弯曲元件的钢筋表面上的环氧树脂粘结PZT，（b）嵌入在剪切临界梁混凝土内部的PZT和（c）外部环氧键合的PZT连接到被测元件的混凝土表面。智能压电材料已在测试之前根据元件的潜在挠曲和剪切裂纹进行了预安装。还介绍并讨论了使用统计损坏指数的值对检查的损坏程度进行定量评估的情况。使用建议的无线监视技术从PZT的测量中获取的电压信号和指标值表明，健康的频率响应与每个测试元素的受检损坏水平之间存在明显差异。这些差异清楚地表明存在损害，而它们的等级揭示了发生的损害的程度。也已经获得了有关在早期损坏阶段预测致命故障的有希望的结果。

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